Milling machine



w. HOIER" El AL Jan. 11,

MILLING MACHINE 9 Sheets-Sheet 1 Filed Sept. 15, 1943 IN VE N TOR. l Va/fier Hoisr BY E/chamA/C/fffo A TTOB NE Y Jan. 11, 1949. -w. HOIEYR ET AL MILLING MACHINE Filed Sept. 15, 1943 9 Sheets-Sheet 2 iATTOBNEY Jan. 11, 1949. w. HOIER ETAL MILLING MACHINE 9 Sheets-Sheet 3 Filed Sept. 15, 1945 n mNw R/Wm U 1 0.6/ N I1 11111111111111|||||||lllllllxxllxlill wC. B MHM m j PWMW U MUM MN WM m5 W MM \N *w wk 1 NW \N MN WW N. N R hm o Q um I) kw m 1; m um b mw 1H 1| m fl www Nb 0 1 mm v w Mb 90 mb N9 3v hm QN v m M mm QM Jam. 11, 1949. w. HO'IER ETAL MILLING MACHINE 9 Sheets-Sheet 4 Filed Sept. 15, 1943 IIIII.

l-lulll Wa/fer Ho/er icha/d N C/iffon M 94 74 INVENTOR ATTOENEY Jan. 11, 1949- w. HOIER ETAL ,458,

MiLLING MACHTNE Filed Sept. 15,194; 9 Sheets-Sheet 5 ATTORNEY Jan. 11, 1949. w. HOIER ET AL MILLING MACHINE 9 sheet's-s heet 7 Filed Sept. 15, 1943 INVENTOR. Wa/f'er Ho/er EicharvNQ/iff n HTTO NEY Jan. 11, 1949, w. HOIER fET AL MILLING MACHINE 9 Sheets-Sheet 8 Filed Sept. '15, 1943 g n um Y @Z. M "Md N e E Wm W2 T MhW am e &

W. HOIER ETAL Jan. 11, 1949,

MILLING MACHINE Filed Sept. 15, 1943 9 Sheets-Sheet 9 8 u w 3v 7 m9 IN VENTOR. Wa/fer Ho/Zer H. 0 N :B N m M? 1 AH .mW Y B Patented Jan. 11, 1 949 Minnie E Walter Hoier-arid Rihard N2 Giff "Cincinnati;

()hioya'ssignors to'iThe Cincinmitil'olilliiigilvla' chine (30., Cincinnati;- Ohi-'o; a-corporation of Ohio ApplicationSepteni-lier 15, lei'a-seriai N6. some '12 Claimsr This invention relates to milling machine'sand more particularly to improvements in automatic cyclic mechanisms for such machih-es One-of the objects'of this-immune is to pro vide an improved automatic milling machine-for cutting or forming radial tapered grooves; i

Another object of this invention is'to provide an improved machine for the purposes disclosed w'h'ieh is efficient, time-saving and practical;

Another object of this invention is to provide an improved automatic machine which will cut or form a longitudinal tapered groove-or indentation in a single pass between the cutter and-Work;

A further object of this invention is to provide: an improved and compact mechanism forautomatically effecting the required relativeiriove ments between the tool'and work-to form a series of radial tapered grooves in automatic'succes'sioni An additional object of this invention is to pro:

vide an improved and combined table oscillating and indexing mechanism.

Other objects and advantages-of the present invention should be readily apparent by refer ence to the following specification, considered in conjunction with the accompanying drawings forming a part thereof and it is tobe understood that any modifications maybe made in the exact structural details there shown and described, within the scope of the appended claims, without departing from or exceedihg'the spirit of the invention. f

Referring to'the drawings inwhicli like refer-f ence numerals indicate like or similar partjszf Figure 1 is an elevational View of a machine embodying the principles of this invention.

Figure 2 is a plan view of the work supporting fixture shown in Figure 1.

Figure 3 is a section on the line 33 of Figure 2.

Figure 4 is a partial end View as viewed from the right of Figure 2 showing certain automatic trip controls. I i

Figure 5 is a partial sectional viewas viewed on the-line 5-5 of Figure 1. t

Figure 6 is a plan View of the pintle as viewed on the line 6--6 of Figure 3. v

Figure 7 is a section-as viewed on the line l- 'l of Figure 6.

Figure 8 is a detail elevational view of the'trip control mechanism for the oscillating and indexing'fixture. I

FigureQ is a plan view of the parts shownin (CLEO-+2155);

Figure fir is a' section-on theline H -lief Figure 10i =HFigure :12 i

Figure-9i Y I .5 Figure :13 is a de'tair viewer the' osciliatienrate eent'roream' Y Fig'lile i lis an eiifl'view of the earnas viewedfrom the rig ht'oi Figure 13.

t Figure 154s a diagrammatic viewer thehytlraw 19, lio eontroleireuits Figure .iaais a section on" the lirie l fi iii of Figure 12. w I

'Refei r ihg to Figuie lofth' dr-avling's the'ref erence riumerar l 0 indicates the bed at a rear-shine train-the be of wh'ich upfises a column 1 t n-avirig suitably- 'foirned-enideweys l 2 for recewmea vertieaily adjustable spindle carrier '13. A-eutter spindle is' iournaled*in the carrier for newer rotating. a cutter 1-5. I

. The topvef the"bed is provided'with "a; dovetailee' guidevvaw I 8 is partially showri in Figure 4 on whidli a table reciproeab1yineiintee;

V The table ifiaif =b reeiprecetedsuitable form or transmission whichwill impart at-rantematidreeiprocatiiig eycle to' the i table iiiiilud'iiig rapidadvanee; feddhd rapid retnrri j theifiech anism'shewn-in cep'e'fiaiiig eppheatiori Serial No.- 483,686} filed April- 19;. 1943; new Patent No. Magus-issued Ju e l7-, 147,bifig suitable fer this a ness. "Since the particular mechanism for reeipreeating-thetable-rorins no part of th preseiit irivntion,-" further deseription "thereof is net believed to be necessary.

This inachine 'is intended more partieularly foi- I ir'iilar'and 'thattliere are} a number of radial provide e of upstanding ve'ne'sidi rir ine ee'st t-heis been the practice is ic rin' groove W tt-seriesor successive passes between" the tool and work and effecting a slight indexing mevenient between eeenpess, By means of this invention; tlie' ta pe'red i greove' is formed during a single pass between the cutter and ivgrk; This;

H isaccomplished by sci llating" the wo mp eee at "Ref riiigfto F'ig'ure iiithework supporting ture eenipnses bssein rn er 2i which is pivot:

ally siipported atone end, n a nintien' rnounted in a pintle block 23 whieiiissecnred to the-table euttiiigtape'rea grooves or spaces in a work pi'e'ee by th seiei efneehi hier'ei I l 8 in Figurez. is figure it- "Will -"be noted that "the work t ered grooves 1 9i which when formed ate during the ieri ittrdihai by bolts 24. This provides a pivotal connection whereby the entire fixture may be angularly adjusted relative to the plane of the table IT. The other end of the fixture is provided with a rod 25 which is adapted to rest on a sine block 26, the sine block being interchangeable to provide different heights in accordance with the angle of inclination which is desired for the fixture, The fixture .and block are clamped to the table by a pair of clamping members 21 which are supported at one end on adjustable screws 28 and held down by clamping bolts 29. An adjustable screw 30 is threaded in the end of the fixture for supporting the fixture during changes in the sine block.

An oscillatable table 3| is supported by antifriction bearings 32 for rotation on the base member 2|. The table 3| carries a support 3211. for an indexible table. The support 32a is guided for longitudinal movement by blocks 33 which ride in a rectangular guideway 34. The adjustment is effected by a screw 35 which is threaded in a nut 36 that is attached to the table 3|, the screw being journaled at 31 in the projecting end of the index support 32a. An indexible table 38 is journaled by means of a depending pintle 39 in the support 32a and carries a work supporting. platen 40 upon which a Work piece indicated by the numeral I8 is attached. The attaching means comprises an upstanding rod 42 upon which is mounted a bushing 43 which is of proper size to suit the bore 44 in the work piece. A work clamping washer 45 and clamping bolt 46 are provided for securing the work to the platen 40.

The indexible table 38 is indexed during each return stroke of the table l1 and this indexing movement is efiected by a rack piston 41 which is slidably mounted in a cylinder 48 formed in the support 32a. As shown in Figure 15 the rack piston 41 engages with gear teeth 49 of a ratcheting member 50 supported for rotation on the member 32a. The ratchet plate 50 carries a spring pressed ratchet plunger which is adapted to engage ratchet teeth 52 formed on the underside of the detent plate 53 which is secured by bolts 54 to the indexible table 38. As the member 50 rotates counterclockwise, as viewed in Figure 15, the cam surface 55 effects withdrawal of a locking plunger 56 while the hold-back plunger 51 prevents rotation of the table 38. When the piston 41 reverses and moves to the left, the table 38 and connected plate 53 rotate in a, clockwise direction to a new indexed position.

Since the index table has a series of definite positions, it is necessary to position the work on the table in a definite manner, especially if the work comes to the machine with the ribs partially cast whereby the function of the machine is to remove the material between the partially formed ribs. This is readily accomplished by providing a, work positioning plunger 58 which is slidably mounted in a support 59 attached to the end of the base member 32a and this plunger is normally held in a retracted position by a spring 60.

The end of the plunger is provided with a work locating member 6| which is beveled on opposite sides as shown in Figure 2 so that it may be projected forward until it engages between a pair of vanes 20, thereby centralizing the vane relative to the center line of operation 62 indicated in Figure 2, of the drawings. The plunger 58 is held against rotation by a key 63 which engages a suitably formed slot 64 formed on the upper surface of the plunger 58.

After the work has been suitably indexed, the table 3| is oscillated at a rather fast rate during the rectilinear feeding of the table This is effected by a second rack piston 65 which is slidably mounted in a cylinder 66 which is more particularly shown in Figure 5. Due to the rather fast rate of oscillation, it is necessary to prevent pounding of the parts, and therefore, means have been provided in opposite ends of the cylinder to cushion the stroke of the piston. This means comprises a, pair of adjustable dashpot members 61 which are connected by headed bolts 68 to adlusting screws 69. which pass through the cylinder. heads for adjustment from the outside. These not only cushion the stroke of the piston but also determine the length of the stroke. The rack piston 65 engages a gear member 10 which as shown in Figure 3 is secured to the underside of the table 3| by bolts 1 I.

The rack pistons are automatically actuated in accordance with reciprocation of the table I1. The hydraulic circuit for controlling the flow of fluid pressure to these pistons is shown in Figure 15. Fluid pressure is supplied to this circuit by a pump 12 which is driven by an electric motor 13 mounted on top of a tank 14 which is attached to the end of the bed |0 of the machine as shown in Figure 1 of the drawings, The fluid is withdrawn from the tank or reservoir 14 and forced through a relief valve 15 to a pressure supply channel 16.

The channel 16 has a branch connection to pressure port 11 of a pilot valve 18 which controls automatic reversal of the oscillating table 3|. As shown in Figure 11 this table has a bracket 19 secured thereto as by bolts and in the end of this bracket is an adjustable dog screw 8| which is positioned to engage the end of the pilot valve plunger 82.

The pilot valve has a pair of ports 83 and 84 which are connected by channels 85 and 86 to opposite ends of a reversing valve 81. The channel 86 is directly connected to port 88 located in one end of the reversing valve housing 8'! While the other channel is connected to the port 89 through an intermediate control valve 90. This valve has a pair of ports 9| and 92 which are adapted to be interconnected by an annular groove 93 in the control valve plunger 94. When this valve is raised as viewed in Figure 15, pressure in channel 85 will flow through the annular groove 93 to the port 89 and shift the reversing valve plunger 95 to the right. The reversing valve 81 has a pressure port 96 which is connected to the main supply line 16, but through the control valve 94.

In other words, the port 96 is connected by channel 91 to port 98 and this port is adapted to be connected by an annular groove 99 to port I00 which has a branch |0| leading to line 76. It will be obvious that the rate of oscillation of the table 3| may be controlled by controlling the rate of flow to the cylinder 66. To this end the valve plunger 94 has a throttling portion I02 formed thereon which is adjustable relative to the port I00, and this plunger is normally urged downward by a spring I03 which tends to move the plunger to a port closing position. The plunger is connected by an arm I04 to a rod I05 which carries a follower I06 which is adapted to ride a rate control cam I01. The cam I0! is carried by the bed of the machine as more particularly shown in Figure 8.

When the valve plunger 94 is in the position shown in Figure 15 the port I00 is nearly closed network shown in Figure 15. The port 96 will remain-connectedto port I08 and since: the latterliszconnectedhy channel 109 to port I I'0'located in the? lefitzend of cylinder 66,: the-plunger-65-:willnbe: moved. to the position in which it. is: shown in: Figure'l5' and heldiin that position by .the pres-- snrein channel I09. As the :table .II advancesy or' mother Words, moves. to the left asshown -.in.. Figurelfi, the cam I01 will raise the follower I06 1 and thereby the control'valve 94, which will inter connect port 9| with port 92, therebyshifting the reversing valve plungenQS and starting ,recipro cation or theoscillatingtable-S I As the-table-3I movesin a counterclockwise directionit will shift the pilot valveplunger and interconnect. pressure port :11 with'port 84,- thereby causinga shifting ofthereversingvalve plunger 95 to the left interconnecting ports 96v and+I08andefiect clockwisev movement of thetable 3i. It will, be. noted that-1 the pilot valve plunger has an enlarged centralspool. I I2 whereby the valve willautomatically fire as it passes through the central position and-also the reversing valve 95 has an enlargedacentralfl spool I I3 .toinsure that theplunger automatically.

completes its shifting movement after it. passes the center position so that neither ofthese valves will have a tendency to hold upina partially fired.- position. I

The; supply channel I6 is also connected to .a port I Id of a reversing valve I I5 for the indexing piston. The opposite ends of: cylinder 48 have ports I I6 and HT which are connectedlby chamnels II8and I I9 to ports I and IZI of valve II5, When the plunger I22lis totheright as shown. the port I I4 is connectedto port I2I whereby fiuid. pressure will. flow tothe right end of cylinder 48 andwhen the plunger I22 is shifted to the left}. port I I4 is connected to port I20 and fluid.pres.-- sure will flow to the other endof cylinder48l When the plunger 41 shifts totheleft itiunn covers a port I23 which is connectedby channel I24 to an automatic stop valve I25. I

Thisstop valve is located underneaththe plate, 53- and is normallyheld in a depressed positionbythe plateagainst the resistance ofoa -springvl26 so that the port I21 is connectedby an annular grooveI28 to a port I 29. This port has achannel I I30 which leads to a cylinder I3I. that has. a contained plunger I32. Pressure willnormallyholdtheplunger I32 in a retracted positionagainst. the resistance of a sprin I33. Uponzcompletion of a full revolution of the table 38,- which means that a work piece has been completed, a depresv sion I43 formed inthe underside of the plate 53,

which is integral with, the-table, will movewinto" position permitting the plunger I25ato'move up under the urge of spring I26 and thereby-discon-r nect port I21 from port I20. The latter, however-,1.

antennae-mien is sadapted to move into a dot lfitormediin the sideof/astopnog I37. This dog issin a position to engage a -stop. plunger I38'= mounted omthamachine:bed; and depression of" 5 plungerrliiflzwill automatically'stop the machine.

Normally however, the plunger: I32 is held in a retractedLpositidn byj fluid pressureand the dog I3! isfree to'move upward against the resistance of-a light spr'mgr'l 39. Thus, after a full revolution 01.017 the zindexibletablerthe machine is automaticallvistopped.rv

When thereversingsavalve plunger I22 for the table indexing piston'd'ls moves to the left, pres-' sure .fiuidrisiadmittedtto-channel I I 8 which shifts 15i thecinde'x plunger 41 to the right; Completionof this movement willuncovera port I whereby the fluid pressure which shifted the'piston may continuesthrough a channel MI and chokecoil I425toithe-right hand endof a pilot valve I43a.

;Theoshifting of'this pilot valve against the resistance-oi a spring- I44 Will interconnect a pressuresiport mig. to which-a branch I46 from the mainasunpiy dine-:16 -is connected, to a port I4'I.

Fluid pressure can now flow through port 'I41 andrzchannel M81430" port I49 and thereby shift the areversing-valve plunger I22 to the right.

It should be obvious that, as soon as the plunger I tz'iisrshifted'to the right, the-port I20 will be connectedsto an exhaust port I50which immediateiy,relievesxthe pressure in the left'hand end of "cylinder-'48 and since the space at this end of the cylinder is connected through channel I toctherpiiot valve -I43a the pilot valve plunger wouldretnmunder the urge of spring I44,thereby 5; disconnecting the pressure from channel I48 which pressure initiated the movement of plunger I22; andAtherefore in order to delay the return movement rob-plunger Ia and insure the complete shiftin 'g of'plunger I22 the choke coil I42 opposite sdirec-tionxby at-trip grnechanismr compris- 45- ing 'as trip plunger I5I which is operatively connectedwbyia bell crank 15? to the valve plunger I22. The-plungerrI-EI carries arpawl I52a which. is adapted-Ito interengage with a-fixed dog: I53;

The pawl is bifurcated as shown in Figure 4,.

" Whfleothe :end. of the plunger is provided :With

a projection IEk-Whereby upon-movement in one direction the pawl will; be rotated without efiecting-movement of the plunger I St, but upon move-.

ment inrthe other" direction the projection will 55" prevent i'rotationr'of -the pawl and the plunger will:beelevatedpthereby effecting shifting of the plunger 122..

It should-be noted that as soon as the-tripplunger :I 5 Ir is actuatedto shift the valve plunger I22. a complete cycleof operation will be effected 1 In other words, it will move by;--the piston '41. from its starting positionshowmin Figure 15 to theeright until'lit :hits the end of the cylinder,

ahWhiCh-utime the port I40 becomes uncovered *andt-the pilot valve isactuated, causing return Ofmth valve-plunger. I22'to the position shown in -Figure-.l5-:whereby, pressure :will now flow to theright handzen-d of cylinder 48, thereby supporting table-hasmniadea complete rotation,

at lwhichnthnewthe reciprocation of the. table J wiiliberstopped;

In the cycle of operation of the machinethe operator throws the control lever I55 which starts the table moving toward the left as viewed in Figure 1 at a rapid traverse rate to move the work piece up to the cutter, and then a dog I55 automatically changes thisrate to a feed rate. At the same time the plunger I06, as shown in Figure 8, engages the cam I01 which thereby raises the rate control valve plunger 94 causin oscillation of the support 3|. This cam which is shown in detail in Figure 13 is angularly adjustable to vary the rate of oscillation and to this end is provided with a hole I51 by which it is fastened by a bolt I58, shown in Figure 8, to the rear side of the bed II] as shown in Figure 4, and this bolt may be loosened to permit angular adjustment of the cam.

The cam is also provided with a slotted hole I59 through which passes a second bolt I50 for securing the other end of the cam to the bed. To prevent shifting of the cam, a lock screw IEI is threaded in a plate I62 at one end and a screw I63 which is threaded in a plate I64 at the other end.

The support 3I will continue to oscillate during the feeding movement until reversing dog I65 rotates the trip control plunger I66 whereupon the table I! will return at a rapid rate. During this return movement the index plunger I5I will be trip actuated, thereby indexing the support 38. The table I1 again reverses and repeats the cycle.

At the end of each cycle, the dog I31 inefiectively engages plunger I38, but after a complete rotation of the indexible table, the dog is rendered effective and stops the table II.

It is to be understood that the various hydraulic connections are made flexible wherever it is necessary. As shown in Figures 3, 6 and '7, however, a multiple swivel connection is provided in order to conduct fluid through the oscillating table to the index mechanism. This connection comprises a shouldered sleeve I61 having a series of circumferentially spaced ports, one of which is indicated at I68, there being a port for each L of channels H8, MI, I39, and H9 which lead to the index cylinder 48 and control valve I25, and one also for the exhaust or return channel I35a.

The sleeve I61 fits in a bore I69 formed in the portion I10 of the oscillatable table 3I, and in turn, has a bore I1I in which fits a multiple grooved cylindrical member I12 which depends from the under side of the table 3|. Thus, the members I10 and I12 on the outside and inside of sleeve I51 rotate with the table 3|, while the sleeve is held stationary by a block I13, Figure 7, which has a lower lip I14 which fits under the sleeve and holds it axially in position, and an end portion I15, shown in Figure 6, which engages a notch I15 formed on the end of the sleeve for preventing rotation thereof.

Each port I68 communicates with a bore I11 which has a radial port I18 that registers with one of the annular grooves I19. connects with an axially extending bore from which radiate the interdrilled connections for each channel as shown in Figure 6. The ends of these channels are connected by a coil of pipe, one of which is shown at I80 in Figure 1 to the proper ports as indicated on the diagram in Figure 15.

There has thus been provided an improved machine for shaping tapered grooves in a work piece by one continuous feeding movement be- Each groove 8 tween cutter and work by automatically effectinga fast oscillation of the work support during the advancing movement, together with means for indexing the work relative to the oscillating support whereby a succession of such surfaces may be formed automatically around the periphery of the work and means for automatically stopping the machine when a work piece has been completed.

What is claimed is:

1. In a milling machine having a rotatable cutter and a reciprocable table, the combination of means for supporting a work piece on the table including an oscillatable support and a superimposed indexible support, fluid operable means carried by the table for effecting the oscillation and the indexing respectively, and trip operable valve means for connecting fluid pressure to each of said means in a sequential manner.

2. In a milling machine having a rotatable cutter and a reciprocable table, the combination of means for supporting a work piece on the table including a base member, an oscillatable sub-support and a superimposed indexible support, means trip operable during advance of the table to cause oscillation of the sub-support, and additional means trip operable during return movement of the table to efiect operation of said indexible support.

3. In a milling machine having a cutter, a reciprocable table, the combination of means for supporting a work piece on the table for oscillatory movement during rectilinear advance of the table including fluid operable means to effect said i oscillation, a reversing valve, a throttle valve having a source of pressure connected thereto, and cam operated means for opening said throttle valve during advance of the table, and for closing said valved uring return movement of the table.

4. In a milling machine having a rotary cutter and a reciprocating table, the combination of means mounted on the table for oscillatably supporting a work piece during advancing movement of the table relative to the cutter including fluid operable means to effect said oscillation, a reversing valve, a pilot valve for controlling shifting of the reversing valve, and means trip operable by the table for disconnecting the pilot valve from the reversing valve to stop said oscillation.

5. In a milling machine having a cutter support and a work support movable relative thereto, the combination of an oscillatable support mounted on the work support, means to control said oscillation including a fluid operable motor, a reversing valve therefor, a source of pressure, a pilot valve trip operable by the oscillating support to connect said source for shifting said reversing valve, a throttle valve for connecting said source of pressure to the reversing valve during advance of the work support, and means in the throttle valve for disconnecting the source of pressure from said reversing valve and simultaneously disconnecting said pilot valve from said reversing valve during return of the work support.

6. In a milling machine having a rotating cutter and a reciprocable table, the combination of means for supporting a work piece for oscillatory movement during feeding movement of the table including a base member mounted on the table and having a piston and cylinder contained therein, an oscillatable support mounted on the base member and operatively connected to said piston, a reversing valve for the piston, a pilot valve having a source of pressure connected thereto and trip operable by the'oscillating mem-v ber for effecting shifting of the reversing valve, channels connecting the pilot valve to the reversing valve, and trip operable valve means for opening and closing one of said channels to control the starting and stopping of said oscillation.

7. In a milling machine having a rotary cutter and a reciprocating table, the combination of means for supporting a work piece on the table for oscillatory movement relative to the cutter including an oscillatable support, a fluid operable control mechanism for effecting said oscillation including a throttle valve having a source of pres-- sure connected thereto, trip operable means for opening said throttle valve including a cam, said cam being formed to uniformly increase the opening of said throttle valve as the table advances and thereby increase the rate of oscillation as the cutter approaches the axis of oscillation of the work.

8. In a milling machine having a rotating cutter and a reciprocating table, the combination of a fluid oscillatable work support mounted on the table, a throttle valve for connecting a source of pressure to said fluid oscillating means, a plunger carried by the table for actuating said throttle valve, a cam mounted on the bed for engaging said plunger, and means to adjust the angularity of the cam to vary the rate of acceleration of said oscillatory movement during a predetermined advance of the table.

9. In a milling machine having a rotating cutter and a reciprocating table, the combination of a work supporting fixture mounted on the table including a base member, an oscillatable support anti-frictionally supported on the base member, means to adjust the angularity of the base member relative to the plane of the table, a work supporting platen mounted on the oscillatable support, means to efiect a relative adjustment between the platen and the oscillatable support to vary the relation between the index axis and the oscillatory axis, fluid operable devices to effect said oscillation and said indexing, trip plungers carried by the table for initiating actuation of each, and means operable by the indexing table to stop the Work table.

10. In a milling machine having a rotating cutter and a reciprocating table, the combination of a work supporting fixture mounted on the table including a base member, an oscillatable support anti-frictionally supported on the base member, means to adjust .the angularity of the base member relative to the plane of the table, a work supporting platen mounted on the oscillatable support, andmeans to effect a relative adjustment.

between the platen and the oscillatable support to vary the relation between the index and the oscillatory axis.

11. In a milling machine having a cutter support anda reciprocatable work support, the combination of an oscillatable table mounted on the work sup-port, said support being movable at a rapid traverse rate to advance the table to the cutter and at a feeding rate to effect machining of the work, means trip operable during movement f-the support at the feed rate to initiate oscillation of the table, means to determine the amplitude of said oscillation and additional means independent of the feed rate to vary the rate of oscillations of a determined amplitude.

12; In a milling machine having a cutter support and a reci procatable work support, the combination of .an oscillatable table mounted on the work support, said support being movable at a rapid traverse rate to advance the table to the cutter and at a feeding rate to eiiect machining of :the Work, means trip operable during movement of the support at the feed rate to initiate oscillation of the table, power means to vary the rate of said oscillation during a constant feed rate machining operation, and additional independently adjustable means to vary the angle of oscillation of the table.

' WALTER HOIER.

RICHARD N. CLIFTON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 502,257 Jones July 25, 1893 529,013 Barnes Nov. 13, 1894 602,884 Urban Apr. 26, 1898 1,775,184 Abbott Sept. 9, 1930 1,799,608 Tscherne Apr. 7, 1931 2,007,827 Fletcher July 9, 1935 2,216,550 Ernst Oct. 1, 1940 2,261,052 Coflin et al Oct. 28, 1941 2,359,601 Andrew et a1 Oct. 3, 1944 FOREIGN PATENTS Number Country Date 285,642 Great Britain Feb. 23, 1928 402,211 Germany Sept. 15, 1924 

